You've got me fully agreeing with you, Erh.germany! Stealing someone's identity from them is horrible.

Calluna's prompt had me originally focusing on the compass as a key for Mrs. Ellerton to use in her story about herself as a one of the women from WWII breaking radio codes. From there I squirreled through articles online and ended up clicking a link to "brainwashing" during interrogations. I had a rough draft with Mrs. Ellerton being captured by enemy forces after delivering the compass key to Nick then being brainwashed into revealing sensitive information and ultimately working for the other side. The plot was becoming a bit long winded though and I couldn't trim it down to my satisfaction where it would make sense for Mrs. Ellerton to be telling the story. That's where I had the idea of having it be "Sarah/Susie" being the person Mrs. Ellerton was talking about in her story. The facility where "Sarah/Susie" worked was really a testing ground for captured agents following the procedure.

I also didn't like Susie's character from the prompt and felt that the "brainwashing" was a good way to leave some question as to her true personality. Writing a continuation where she is saved from being used against her will would be fun. (Though I make no promises on keeping my stories short.)

Have a great day and thank you so much for your questions!